import XLSX from 'xlsx-style'
// eslint-disable-next-line import/no-webpack-loader-syntax
require('script-loader!file-saver')

function datenum (v, date1904) {
  if (date1904) v += 1462
  var epoch = Date.parse(v)
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}

// eslint-disable-next-line camelcase
function sheet_from_array_of_arrays (data, opts) {
  var ws = {}
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  }
  for (var R = 0; R !== data.length; ++R) {
    for (var C = 0; C !== data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R
      if (range.s.c > C) range.s.c = C
      if (range.e.r < R) range.e.r = R
      if (range.e.c < C) range.e.c = C
      var cell = {
        v: data[R][C]
      }
      if (cell.v == null) continue
      // eslint-disable-next-line camelcase
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R
      })

      if (typeof cell.v === 'number') cell.t = 'n'
      else if (typeof cell.v === 'boolean') cell.t = 'b'
      else if (cell.v instanceof Date) {
        cell.t = 'n'
        cell.z = XLSX.SSF._table[14]
        cell.v = datenum(cell.v)
      } else cell.t = 's'

      ws[cell_ref] = cell
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
  return ws
}

function Workbook () {
  if (!(this instanceof Workbook)) return new Workbook()
  this.SheetNames = []
  this.Sheets = {}
}

function s2ab (s) {
  var buf = new ArrayBuffer(s.length)
  var view = new Uint8Array(buf)
  for (var i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xff
  return buf
}

function exportJsonToExcel ({
  title,
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  color,
  autoColor,
  bookType = 'xlsx'
} = {}) {
  // const merges = [`A1:${getCharCol(list.length - 2)}1`]; //合并单元格
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]

  data.unshift(header)
  if (title) {
    data.unshift(title)
  }
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }
  var ws_name = 'SheetJS'
  var wb = new Workbook()
  var ws = sheet_from_array_of_arrays(data)

  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = []
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }

  if (autoWidth) {
    /* 设置worksheet每列的最大宽度 */
    const colWidth = data.map(row =>
      row.map(val => {
        /* 先判断是否为null/undefined */
        if (val == null) {
          return {
            wch: 13
          }
        } else if (val.toString().charCodeAt(0) > 255) {
          /* 再判断是否为中文 */
          return {
            wch: val.toString().length * 2
          }
        } else {
          return {
            wch: val.toString().length
          }
        }
      })
    )

    // console.log(colWidth);
    /* 以第一行为初始值 */
    const result = colWidth[0]
    colWidth[0][0]['wch'] = 13
    // console.log(colWidth[0][0]["wch"]);
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch']
        }
      }
    }
    ws['!cols'] = result
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name)
  wb.Sheets[ws_name] = ws
  var dataInfo = wb.Sheets[wb.SheetNames[0]]

  // const borderAll = {
  //   //单元格外侧框线
  //   top: {
  //     style: "thin"
  //   },
  //   bottom: {
  //     style: "thin"
  //   },
  //   left: {
  //     style: "thin"
  //   },
  //   right: {
  //     style: "thin"
  //   }
  // };
  // 给所以单元格加上边框
  // for (var i in dataInfo) {
  //   if (i == '!ref' || i == '!merges' || i == '!cols' || i == 'A1') {

  //   } else {
  //     dataInfo[i + ''].s = {
  //       border: borderAll
  //     }
  //   }
  // }

  // 标题行
  const arr = [
    'A1',
    'B1',
    'C1',
    'D1',
    'E1',
    'F1',
    'G1',
    'H1',
    'I1',
    'J1',
    'K1',
    'L1',
    'M1',
    'N1',
    'O1',
    'P1',
    'Q1',
    'R1',
    'S1',
    'T1',
    'U1',
    'V1',
    'W1',
    'X1',
    'Y1',
    'Z1'
  ]
  // arr.some(function(v) {
  //   let a = merges[0].split(":");
  //   if (v == a[1]) {
  //     dataInfo[v].s = {};
  //     return true;
  //   } else {
  //     dataInfo[v].s = {};
  //   }
  // });
  // 设置主标题样式
  const style = {
    font: {
      name: '宋体',
      // sz: 30,
      color: { rgb: '000000' },
      bold: true
      // italic: false,
      // underline: false
    },
    alignment: {
      horizontal: 'center',
      vertical: 'center'
    }

    // fill: {
    //   fgColor: {rgb: "008000"},
    // },
  }

  // dataInfo["B1"].s = style;
  // dataInfo["A1"].s = style;

  // excel标题样式
  for (var i = 0; i < header.length; i++) {
    if (autoColor) {
      dataInfo[arr[i]].s = {
        font: {
          name: '宋体',
          // sz: 30,
          color: { rgb: color[i] },
          bold: true
        },
        alignment: {
          horizontal: 'center',
          vertical: 'center'
        }

      }
    } else {
      dataInfo[arr[i]].s = style
    }
  }
  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  })
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream'
    }),
    `${filename}.${bookType}`
  )
}
function toExportExcel (tHeader, data, filename, color = [], autoColor = false) {
  import('@/components/excel/Export2Excel').then(excel => {
    // 表头对应字段

    excel.exportJsonToExcel({
      header: tHeader,
      data: data,
      filename: filename,
      color: color,
      autoColor: autoColor,
      autoWidth: true,
      bookType: 'xlsx'
    })
  })
}
export { toExportExcel, exportJsonToExcel }
